Forces

Question 0

What is the relationship between unbalanced force and acceleration

Answer 0

The bigger the unbalanced force actin on an object the bigger the acceleration

Question 1

What does an unbalanced force act on

Answer 1

An object along the line in which the object is moving

Question 2

What is the relationship between acceleration and mass

Answer 2

If the same force is applied to objects of different mass the larger object will have less acceleration

Question 3

What is the equation to find acceleration

Answer 3

Acceleration = force

Mass

Question 4

How would you find the stopping distance

Answer 4

Thinking distance +braking distance

Question 5

What is the thinking distance

Answer 5

Time taken before the brakes are applied

Question 6

What can lengthen thinking distance

Answer 6

Tiredness
Drugs
Poor visibility

Question 7

What does distance travelled while thinking depend on

Answer 7

Speed of the vehicle

Question 8

What is the braking distance

Answer 8

The distance travelled by the vehicle after the brakes are applied

Question 9

What can effect the braking distance

Answer 9

Brake tyre condition
Condition of road surface
Mass of car

Question 10

What happens to objects falling through liquids and gases

Answer 10

They experience a drag force that increases with their speed

Question 11

How is terminal velocity reached

Answer 11

When the drag force on an object balances the weight

Question 12

What can effect the drag force

Answer 12

The shape

Objects must be streamlined to reduce drag

Question 13

What is resultant force

Answer 13

If there is an unbalanced force the the object will accelerate in that direction

Question 14

What is a balanced force

Answer 14

If the forces are balanced then the object will not move

Question 15

What is Newton’s second law

Answer 15

Force = mass x area

Question 16

What is acceleration

Answer 16

It is how quickly the velocity is changing

Question 17

What is the equation for average speed

Answer 17

Average speed = total distance

Total time

Question 18

What is the equation for moments

Answer 18

Moment = force x perpendicular distance

Question 19

What is the principle of moments

Answer 19

If an object is balanced then

Total anticlockwise moment = clockwise moment

Question 20

If moments are not equal

Answer 20

I the total anticlockwise moments do not equal the total clockwise moments there will be no resultant moment

Question 21

What is the centre of mass

Answer 21

The point where the weight of the body acts

Question 22

What can you use to find e centre of gravity

Answer 22

A plumb line
Wait till it stops moving
Draw a line along it
Do again but from a different pivot
Where the two cross

Question 23

What is the equation for weight

Answer 23

Weight = mass x gravity

Question 24

What is mass measured in

Answer 24

Kilograms

Question 25

What is weight measured in

Answer 25

Newtons

Question 26

What is velocity measured in

Answer 26

M/a

Question 27

What is friction measured in

Answer 27

Newtons

Question 28

Where does weight act from

Answer 28

the centre of gravity of an object

Question 29

How the locate the centre of gravity from a lamina object

Answer 29

Hang object from a point Make a vertical line Hang object from a second point Centre of gravity is where the lines cross

Question 30

Equation for Hooke's law

Answer 30

Force= extension x spring constant

Question 31

What is Hooke's law

Answer 31

The extension of an elastic object is directly proportional to the force applied to it

Question 32

When is the equation for Hooke's law not applicable

Answer 32

This equation works as long as the elastic limit (the limit of proportionality) is not exceeded. If a spring is stretched too much, for example, it will not return to its original length when the load is removed.

Question 33

Elastic potential energy

Answer 33

An elastic object such as a spring stores elastic potential energy when stretched or squashed. The extension of an elastic object is directly proportional to the force applied